'smwp' tag in v5

Anyone know what this tag is for? I don't find it in the v5 spec. My guess is "Spectral Map White Point" but the data doesn't look like that to me.... https://www.color.org/iccmax/profiles/NamedColor.xml Thanks in advance for sharing your knowledge! : ) Jeff Nova Chief Executive Officer Colorhythm https://colorhythm.com Mobile: +1 510-710-9590 Main: +1 415-399-9921